Copyright
©The Author(s) 2021.
World J Orthop. May 18, 2021; 12(5): 310-319
Published online May 18, 2021. doi: 10.5312/wjo.v12.i5.310
Published online May 18, 2021. doi: 10.5312/wjo.v12.i5.310
Table 2 Characteristics of the screws used in this study
| Design | External diameter (max) | Internal diameter (max) | Helical pitch | Type of thread | n (%) |
| cyl/cyl | 6.5 | 4.0 | 3.0 | Buttress | 6 (3.4) |
| cyl/cyl | 7.5 | 4.5 | 3.0 | Buttress | 9 (5.1) |
| cyl/con | 6.5 | 4.0 | 2.5 | Buttress | 40 (22.9) |
| cyl/con | 7.5 | 5.0 | 2.5 | Buttress | 4 (2.3) |
| con/con | 6.0 | 4.0 | 3.0 | V-shape | 48 (27.4) |
| con/con | 7.0 | 4.5 | 3.0 | V-shape | 5 (2.9) |
| con/con | 6.0 | 4.5 | 2.5 | V-shape | 49 (28.0) |
| con/con | 7.0 | 5.5 | 2.5 | V-shape | 14 (8.0) |
- Citation: Bokov A, Pavlova S, Bulkin A, Aleynik A, Mlyavykh S. Potential contribution of pedicle screw design to loosening rate in patients with degenerative diseases of the lumbar spine: An observational study. World J Orthop 2021; 12(5): 310-319
- URL: https://www.wjgnet.com/2218-5836/full/v12/i5/310.htm
- DOI: https://dx.doi.org/10.5312/wjo.v12.i5.310